What is RAID 1?

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Quick Answer

RAID 1, often described as drive mirroring, uses two hard drives with identical information to protect against data loss due to hard drive failure. A RAID 1 configuration is simpler to implement and maintain than other RAID configurations.

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Because all data is stored on two drives, a failed drive can be replaced by copying the information from the functioning drive. RAID 1 can slow writing speeds, but, since both drives can be read simultaneously, it can improve read performance. Since all information is stored in two places, RAID 1 effectively halves the storage capacity of hard drives; more complex RAID configurations can provide more efficient storage capacity.